There are a host of annual climbers, some hardy - sweet peas are perhaps the most widely grown example - and others half-hardy annuals such as ipomoea, the morning glories, with big trumpet flowers in sky blue, deep purple or crimson.

A few examples of such plants are Thlaspi caerulescens for removal of zinc and cadmium, Berkheya coddii for removal of nickel, Asparagus racemosus for removal of selenium, Iberis intermedia for removal of thallium, Ipomoea alpina for removal of copper, Haumanistrum robertii for removal of cobalt and Pteris vitata for removal of arsenic [1].

The aim of the present study was to analyse reports published on a recreational web site by Polish drug users who ingested seeds of plants belonging to the Convolvulaceae family (Argyreia nervosa and various Ipomoea species) and to compare them with available medical case reports.

Four sweet potato cultivars from Embrapa Hortalicas ('Princesa', 'Brazlandia Roxa', 'Brazlandia Branca' and 'Brazlandia Rosada') and one accession of Ipomoea pes-caprae were included in this study, resulting in a total of 82 accessions (Table 1).

Table 3 shows that plants like Andrographis paniculata, Justicia adhatoda, Ipomoea mauritiana, Centella asiatica, Alstonia scholaris, Ocimum gratissimum, Mikania cordata and Mucuna pruriens have been studied in greater details and the findings are well in agreement with their folk medicinal uses in the two villages of Gaurnadi Upazila.

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